Auth0 vs Cognito for B2B Applications
Auth0 vs Cognito for B2B Applications
Choosing between Auth0 and Cognito for a B2B SaaS in 2026 comes down to one trade: do you want AWS-native pricing predictability with engineering hours sunk into multi-tenancy, or a polished developer experience with B2B Organizations baked in but a per-MAU and per-SSO-connection bill that climbs fast? If your stack already lives on AWS and you can spare a senior engineer for two weeks of plumbing, Cognito wins. If you need to sell to enterprise buyers next quarter and SCIM, SAML, audit logs, and multi-org support are non-negotiable, Auth0 wins, and you should also seriously consider WorkOS, which we cover at the end.
This post walks through both honestly: where each one is genuinely the right call, where the marketing hides real costs, and what to do when neither shape fits your B2B reality.
What B2B SaaS actually needs from auth
Before comparing, name the requirements. B2B SaaS auth is not the same as B2C auth. The hard parts are:
- SAML and OIDC SSO for enterprise buyers who refuse to create new passwords
- SCIM 2.0 directory sync so admins on the customer side can provision and deprovision users from Okta, Azure AD, JumpCloud, or Google Workspace
- Multi-org modeling so one user can belong to many tenants and switch between them
- RBAC at the org level, not just at the global user level
- Just-in-time provisioning so a new SSO user shows up correctly the first time they log in
- Audit logs that your customer's security team can pull during quarterly reviews
- Self-service SSO setup so your customer success team is not on a call walking through metadata XML for every onboarding
Hold both Auth0 and Cognito up to this list and the picture clarifies fast.
Where Cognito wins
Cognito's pitch is simple: you already pay for AWS, your services already use IAM, and Cognito plugs into both without leaving the console. For teams running on AWS, that integration matters more than any feature comparison.
Cost is the headline. Cognito gives you 10,000 monthly active users free, then roughly $0.0055 per MAU after. For a B2B SaaS doing 25,000 logins a month, that is around $82 in auth costs. Auth0 at the same scale starts pushing you into paid tiers that cost real money, especially once SSO connections enter the picture.
IAM integration is the second win. Cognito identity pools hand out temporary AWS credentials so a logged-in user can hit S3 or DynamoDB directly with row-level access controls that map to their identity. If you're building anything where a user needs scoped access to AWS resources (file uploads, per-tenant data buckets, signed URLs), Cognito does this natively in a way no third-party auth provider can match.
No per-connection pricing wall. This is the quiet one. Auth0 charges per enterprise SSO connection. Cognito does not. If you are planning to onboard 50 enterprise customers this year, each with their own SAML IdP, the per-connection math on Auth0 can hit five figures per month before you blink. Cognito charges by MAU only.
SAML support is included. Cognito user pools support SAML and OIDC federated identity providers out of the box, no premium tier required. You can wire Okta, Azure AD, or any compliant IdP and let users log in with their corporate identity. This alone covers a large share of enterprise SSO requests.
So Cognito wins for: AWS-native teams, cost-sensitive B2B with predictable user counts, and apps where federated IAM access is core to the product. If that's you, the calculus tilts hard toward Cognito.
Where Auth0 wins
Auth0 wins on the things B2B SaaS teams actually struggle with after the first sprint: developer experience, B2B-specific features, and not having to write your own multi-tenancy layer.
B2B Organizations is the killer feature. Auth0 ships a first-class Organizations object. One user can belong to many orgs, each org gets its own SSO, branding, roles, and connection settings, and the JWT carries the org context. This is exactly the shape a B2B SaaS needs, and on Cognito you have to build it yourself with custom attributes, Lambda triggers, and a tenant-mapping table. On Auth0, you write zero code for this.
Actions and the Marketplace. Auth0 Actions let you inject Node.js logic at every step of the auth pipeline (post-login, pre-registration, password reset). The Marketplace has prebuilt integrations for HubSpot, Segment, Stripe, MFA providers, and dozens of others. Cognito has Lambda triggers, which are powerful but more bare-metal: you write the integrations yourself, you handle the IAM, and the docs are CloudFormation-flavored.
SCIM provisioning is supported. Auth0 has native SCIM 2.0 inbound and outbound, gated to Enterprise Connections (which means a higher-tier plan). Cognito has effectively no native SCIM. To support SCIM on Cognito today you either build a custom SCIM endpoint that calls Cognito's admin APIs, run a third-party SCIM bridge, or tell your enterprise customer "we don't support SCIM" (which loses the deal).
Self-serve SSO setup. Auth0 has flows where your customer's IT admin can configure SAML themselves through a hosted page. Cognito setup requires your team to handle every connection.
Audit logs and compliance reports. Auth0 ships detailed event logs, exports to SIEM tools, and the SOC 2, ISO, HIPAA, and GDPR reports that enterprise procurement asks for. Cognito's logs go to CloudTrail and CloudWatch, which is fine for AWS-native teams but means more work to surface a clean audit trail for a customer.
Polish and DX. Auth0's docs, dashboard, and SDKs are widely considered the best in the industry. Cognito's docs are notoriously thin in places, error messages are cryptic, and some configuration choices (like custom user attributes) are irreversible without recreating the user pool.
So Auth0 wins for: B2B SaaS with enterprise customers, teams selling to companies that demand SCIM, anyone whose engineers value DX, and any product where multi-org is the data model.
Head-to-head comparison
| Factor | Auth0 | AWS Cognito |
|---|---|---|
| Free tier | 25,000 MAU | 10,000 MAU |
| Cost at 25k MAU + 10 SSO | ~$1,500-3,000/mo | ~$82/mo |
| Cost at 8k MAU + 50 SSO | ~$10,000/mo (B2B Pro) | ~$0/mo (still free MAU tier) |
| SAML / OIDC SSO | Yes, gated to higher tiers | Yes, included |
| SCIM 2.0 | Yes, on Enterprise Connections | No native support |
| Multi-org / B2B Organizations | First-class feature | Build it yourself |
| JIT provisioning | Native | Custom Lambda |
| Self-serve SSO setup | Yes (hosted IdP config) | No (manual per connection) |
| Audit logs / SIEM export | Native, detailed | CloudTrail / CloudWatch |
| AWS IAM federation | Limited | Native (Identity Pools) |
| Vendor lock-in | Standard OIDC export | Cannot export password hashes |
| Best fit for | B2B SaaS with enterprise sales motion | AWS-native B2C or cost-sensitive B2B |
The vendor lock-in row deserves its own paragraph. Cognito will not export password hashes. If you ever want to migrate off, every user has to reset their password on first login. For a consumer app this is annoying. For a B2B app with thousands of users at hundreds of enterprise tenants, it's a coordination nightmare and a reason to think twice before committing.
When to choose Cognito
- You're already deeply on AWS and your team is comfortable with IAM, Lambda, and CloudFormation
- Your B2B customers are mostly mid-market, your SSO needs are SAML-only, and SCIM is not yet a deal-breaker
- Your product needs scoped AWS resource access per user (S3 buckets, DynamoDB row access)
- You have, or can hire, a senior engineer to build the multi-tenancy layer (about 2-4 weeks for a clean implementation)
- You expect your MAU to grow large but your SSO connection count to stay modest
When to choose Auth0
- You are selling to enterprise and SCIM, SAML, and audit logs are showing up in security questionnaires
- Your data model is org-first (multi-tenant) and you don't want to build that scaffolding yourself
- Your engineering team is small and you need DX, docs, and SDKs that don't fight you
- You need to ship integrations with Stripe, HubSpot, Segment, or other Marketplace items quickly
- You can absorb the per-MAU and per-SSO-connection pricing as a cost of selling upmarket
If you're choosing between Cognito's AWS-native control and Auth0's B2B convenience, it might help to read our broader take on in-house engineering versus offshore: the same trade between control and convenience shows up everywhere in startup engineering decisions.
The third option most people miss: WorkOS
The honest answer in 2026 is that neither Auth0 nor Cognito was built for B2B SaaS. Auth0 evolved from a B2C identity platform and bolted on Organizations. Cognito was built for AWS resource access and bolted on user pools. WorkOS was designed from day one for B2B: org-first data model, self-serve SSO config portal, native SCIM, Admin Portal that your customers configure themselves, AuthKit with 1 million free MAU, and per-connection pricing that aligns with revenue rather than punishing growth.
If you are starting a B2B SaaS today and have not picked auth yet, WorkOS is the option that requires the fewest justifications. It gets the data model right, prices honestly for the B2B motion, and removes the "we don't support SCIM" objection that kills enterprise deals. Auth0 is still the right call if you've already built on it; Cognito is still right if AWS lock-in is a feature, not a bug. But for a fresh build, WorkOS is what most experienced B2B founders pick now.
What to do
If you have an existing app on Cognito and you're hitting the multi-tenancy or SCIM wall, you have three options: build a SCIM bridge and tenant-mapping layer on top of Cognito (4-8 weeks of senior work), migrate to Auth0 (2-4 weeks plus a password reset for every user, which is rough), or migrate to WorkOS (similar timeline, but the resulting architecture matches your business shape).
If you're greenfield, the decision tree is:
- AWS-native, B2C-flavored, cost-sensitive? → Cognito
- B2B with enterprise sales, existing Auth0 fluency? → Auth0
- Greenfield B2B SaaS? → WorkOS
The lift is real either way. Wiring auth correctly takes a senior engineer who has shipped multi-tenant systems before, not someone learning on your codebase. On Cadence, every engineer is AI-native by default (Cursor, Claude Code, Copilot fluency vetted in a voice interview before they unlock bookings), and our senior tier ($1,500/week) is where multi-tenant auth work lives. Median time to first commit on the platform is 27 hours, so if you book Monday morning, you'll have working PRs by Tuesday afternoon. The 48-hour free trial means you don't pay until you've seen the work.
For a deeper dive on similar tooling decisions, our comparison of Cursor, GitHub Copilot, and Claude Code covers the AI-native baseline every Cadence engineer brings to a project, and the Toptal vs Turing breakdown covers how booking compares to traditional vetted-marketplace hiring.
If you're sitting on a Cognito implementation that is starting to bend, or weighing Auth0 against WorkOS for a new B2B build, book a senior engineer through Cadence for a week. You'll get a working SCIM-ready auth layer, an honest recommendation on which platform actually fits your shape, and the option to keep the engineer or replace them at the end of the week with no notice.
FAQ
Can I switch from Cognito to Auth0 later?
Technically yes, but Cognito does not export password hashes, so every user has to reset their password on first login post-migration. For a B2B app with thousands of users across enterprise tenants, plan a multi-week coordinated rollout with customer comms. The migration itself takes 2-4 weeks of senior engineering work.
Does Cognito support SCIM for directory sync?
Not natively. You either build a custom SCIM endpoint that calls Cognito's admin APIs, run a third-party SCIM bridge, or tell enterprise customers SCIM is not supported. Most B2B teams that hit this wall end up migrating off Cognito.
Is Auth0 worth $10,000 a month for B2B?
Depends on your ACV. If your annual contract values are $50k+ and SSO + SCIM are unblocking enterprise deals, the math works. If you're a $500/month per seat product, the per-connection pricing eats your margin fast and WorkOS is usually a better fit.
What's the cheapest auth provider for a B2B SaaS?
Cognito is cheapest at the user-volume layer (10k free MAU, $0.0055 after) but the engineering hours to make it B2B-ready often exceed the savings. WorkOS gives you 1M free MAU on AuthKit and per-connection pricing that doesn't kick in until you have paying enterprise customers, which usually nets out cheaper for actual B2B SaaS.
Can I use both Cognito and Auth0?
Some teams use Cognito for AWS IAM federation (signed S3 URLs, scoped DynamoDB access) and Auth0 or WorkOS for the user-facing auth layer. This is workable but you're maintaining two identity systems, which doubles the surface area for bugs. Only do it if the AWS-native federation is genuinely load-bearing for your product.